How to determine your bra size

Step 1: Measure rib cage

Step 1: Measure rib cage

Keeping the measuring tape parallel with the ground, measure around your rib cage directly under your bra. Round all fractions to the nearest whole number. For example, if the tape measure reads 29.5 inches, round this number up to 30 inches. If the measurement is even, add 4 inches. If the measurement is odd, add 5 inches. According to the picture shown, her band size will be 34 inches.

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Step 2: Measure bust

Step 2: Measure bust

Standing straight with your arms at your side, measure at the fullest part of your bust, making sure the measuring tape is parallel with the ground and not binding. Round all fractional measurements to the nearest whole number. With our model, the tape measure reads 37 inches.

Image: IsThisAWiseChoice.com

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Step 3: Determine cup size

Step 3: Determine cup size

Subtract your band size (step 1) from your bust size (step 2). This number equates to the letter of your cup size. With our model we would subtract 34 from 37, which is 3 inches. According to the chart, she would wear a 34C.